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	<title>Document</title>
	
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<body>
	<table width="500px" height="200px" border="1">
		<!-- tr*5>td*5 -->
		<tr>
			<td colspan="2">1</td><!-- 1,2合并,colspan 横跨的列数 （合并列）  --> 
			
			<td>3</td>
			<td>4</td>
			<td rowspan="2">5</td><!-- 5,10合并,rowspan 横跨的行数	(合并行) -->
		</tr>
		<tr>
			<td>6</td>
			<td>7</td>
			<td>8</td>
			<td>9</td>
			
		</tr>
		<tr>
			<td>11</td>
			<td>12</td>
			<td colspan="2" rowspan="2">13</td><!-- 13,14,18,19合并 -->
			
			<td>15</td>
		</tr>
		<tr>
			<td>16</td>
			<td>17</td>
			
			
			<td>20</td>
		</tr>
		<tr>
			<td colspan="5">21</td>
			
		</tr>
	</table>
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